twist

A thin segment of citrus peel, without the pith, used as a garnish on various cocktails. It is called a twist because it is commonly twisted over the surface of a drink to express the essential oils of the citrus and impart its flavor. Twists may take the form of long, thin spirals; broad, roughly-cut segments of peel; or any shape in between. Common twists include lemon and orange twists, but any variety of citrus may be used.